Machine for making concrete pavement



4 SHEETS-SHEET l.

1. M. RATHMEL-L.

MACHINE EUR MAKING CONCRETE PAVEMENT. msn JAN. 12, 1921.

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Mar. 13, 1923.

Mar. 13, '1923.

` J. M. RATHIVIELL.

MACHINE FCR MAKING CONCRETE PAVEMENT.

4 SHEETS-SHEET 2.

FILED JAN. I2, 1921.

4 SHEETS-SHEET 3.

J. M. RATHMELL.

FILED JAN|12|1921 "Iu am IIIUJN ww Ummm Mmmm. wwmunwmun w... u www... .l l.

MACHINE FOR MAKING CONCRETE PAVEMENT.

Mar. 13, 1923.

Mar. 13,v 1923. 1,447,999.

, 1. M. RATHMELL.

MACHINE FOR MAKING CONCRETE PAVEMENT.

f lLEo 1AN.12. |921. 4 SHEETS-SHEET 4.

Patented Mar. 13, i923.

4narran, stares JOHN M. RATHMELL, OF CONNEAUT, OHEOLASSIGNOR T0 DUNN ROAD COMPANY, OF CONNEAUT, OHIO, .A CORPORATION OF OHIO.

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macmNI-tr MACHINE FOR MAKING CONCRETE PAVEMENT.

Application filed January 12, 1921. Serial No. 436,722.-

To all 107mm t ma? concern.

Be it known that JOHNM. RATHMELI., a

citizen of the United States, residing 4at Conneaut, in the county of Ashtabula and State of Ohio, have invented certain new and useful improvements in Machines for Making Concrete Pavement; and I do hereby declare the following to be a full, clear, and exact description 'of the invention, Such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, 'forming part of this specification.

My invention relates to machines for making concrete pavements of the type shown and described in U. S. Letters Patent No. 1,265,499 issued to Allan J. Parrish, May 7 1918.

The object of my invention is to provide in such a machine a vertical moveable strikeoi plate which will strikeof freshly laid conc-rete to the desired contour of the pavement, so that the said plate can be raised up'- wardly out of its working position to permit the machine to be moved backwards.

Another object of my invention is to provide a tamping device adjacent to the front surface of the strike off plate which will be adapted to force the coarser particles 'of the aggregate deep enough below the surface of the mass of concrete so -that said coarse particles will pass under the strike-off plate so that the surface of the concrete left by said strike-ofi' plate will not be scarred or grooved by said particles.

`Another object of my invention is to provide lever actuated means to stop all of the tamping members of the machine in their raised position, by means ofa single lever,

after the strike-od plate has been raisedl are illustrated in the accompanying drawonc-retei pavements embodying my Figure 3 vis a transverse line 3 3 in Fig. l.

Figure 4 is a front elevation with portions thereof broken away. j

Figure 5 is a side elevation of a fragment of t e section on the y machine 'showing lever and latchA mechanism for disengaging one of the power clutches.

Figure 6 is a front View of one of the brackets for supporting the strike-oli plate.

Figure 7 is a side view of the same.

Figure 8 is a transverse section of another form of clearing tamper to be used in front of the strike-od late.

Figure 9 is a ront View of a fra ent of the same with' a portion thereo broken away. v l

- In these .drawings A A indicates the usual side forms for the pavement, which are preferably U-shaped channel irons set on edge at each side of the proposed road-way or pavement, from which position they may be removedafter the pavement has been completed `Upon these said formsis laced a carriage comprised of end beams `B to which are secured the brackets B of the wheels B2, which wheels travel upon the side forms A A. The two end beams B B are secured together by the beams C' C by means of the brackets C C C C', the said brackets C being suspended under the beams B by means of bolts b so that the elevation of the beams C` with relation to the end beams B can be adjusted as desired, and as described in the above mentioned Letters Patent.

The ends of the .beams C are secured together by means of beams D D, as shown and described in said patent; the beams C C and D D thus forming a frame, which is suspended under the end beams B B. Upon the beams C C I place supporting brackets E E (see Fig. 4) upon which are ,placed transverse beams E E. Upon these beams E is mounted a motor F for furnishing the power necessary for operating the machine. I also place'upon the beams E E windlass mechanism F" which is provided with the usual drums F2 F2 to receive cables f (see Fig. 1)*whichpass from said drums around pulleys f which are secured i upon the 'beams D D and extend forwardly from said pulleys to suitable anchors (not shown), at the side of the proposed pavement; the saidl drums andv cables being for the urpose of moving the machine forward durmg its operation.

Between the beams C C is located a beam C2 which is mid-way between the beams C C and parallel therewith (see Figs. 2 Yand 3). Upon the front beams C andthe intermediate beams C2 is placed vertical frames G G Gr. Upon these frames Gnre mounted walking beams H H, from the ends of which walking beams tampers H and H2 are suspended by means 'of adjustable rods being provide/.l

' withnuts h and springs h2 below the walkingbeams, so that the pressure exerted by the walking beams H upon the tampers H and H2 will be cushioned by the springs k2. The tamper H is preferably a' thin plate which is adapted to force the gravel and broken stone downwardly in the mass of concrete, while the tamper H2 is preferably flat on .its under surface and adapted to give a smooth surface to the concrete.

For operating the walking beam H I mount a shaft I in the frames G, and place on said shaft T a friction clutch mechanism T which is provided with a sprocket wheel I2 from which a chain belt T8 extends to the drivingpulley of the motor F. The clutch I has the usual'operating cone z' which is operated by a lever-z, so that when the cone z over a sprocket wheel K2 upon the driven' shaft K2 of the windlass mechanism F', so that as the shaft T rotates, the driving mech-- anism of the drums F2A is also actuated. The drums F2 are provided with clutch mechanism L L and operating levers L so that the said drums F2 can be independently` operated as may be desired, in moving the machine aroundthe corners of a proposed pavef ment. I 'also mount in the frames G another shaft M, the ends of which are mounted in brackets l M secured upon the beams D D.

Upon the ends of the shaft M are placed small sprockets M2 M2 from which chain belts M3 extend forwardly and around sprocket wheels M4 onthe axles of the front wheels VB2 of the machine. This shaft M is provided with clutch mechanism N, said clutch being operated by the hand lever N,

rod N2 and bell-crank lever N". For rotating the shaft M, a chain belt O extends from a ulley on the shaft K2 to the sprocket wheel n of the clutch N, so that when it is desired to move the'machine backwardly, the clutches L of the drumsF 2 are released, and the lever N is operated to force the cone of the clutch N toward said clutch, which causes the shaft M- to revolve, and through the chain belts M8 to turn the front wheels B2 of the machine backwardly; the chain belts l2, K and C being constantly in motionv durin the operation of the machine.

lpon the front beam C are secured brackets 2 (see Figs. 6 and 7) which. brackets are provided with slotted holes p. Upon the brackets is secured a strike-0H' plate Q, which is secured by means of bolts Q which are slidably secured in the slotted holes p in the brackets P so that said strike-off plate can be raised. and lowered. For the purpose of raising the strike-od' plate l mount offset bell-crank levers R in suitable supports uponthe front beam C with a link-bar R extending from onearm of said levers to the pivot R2 in the strike-off plate Q. rThe strike-ofi plate Q is formed so as togive the proper' contour to the upper surface of the cement.

Tn front of the strike-0H plate Q is sus- ',pended a vertically reciprocating tamper S,

which, by means of link bars S', is suspended upon the bell-crank levers S2, which levers are pivoted in suitable supports upon the front beam C. -For the purpose of oscillating the bell-crank levers S2, T mount a spur-gear T upon a stud post secured in the forms G. This spur gear is provided with a crank-pin T', upon which crank-pin a pitman T2 is pivoted and extends, and is pivoted to the opposite end of the bell-crank levers S12.

The pitman T2 is provided with a cushl ioning spring t, so that if the clearing tamper plate S encounters an obstacle during its downward movement, the spring t will be compressed and thus avoid the breaking of the machine. In order to give motion to the spur gear T pinions U are placed above the shaft T which intermesh with the spur gears T, so that the rotation of the shaft T, which operates the tampers H and H2 as hereinbefore described, also causes the clearing tamper S to be forcedl downward into the cement mass, therebyv y forcing any largepieces of broken stone or gravel downward sufficiently to pass the lower edge of the strike-off plate Q5* In ,front of the .clearing tamper "S, T suspend an auxilliary strike-olf plate V by means of brackets V secured to the front beam C; the plate V being stiifened by means of the channel iron V2. As the machine moves forward this auxiliary strike-off* plate V clears the largest portion of the 'lever ilis pivoted a link bar 12 surplus concrete away, so that the strikeoi plate Q is relieved of a large part of the strain incident to striking the top surface of the concrete to the -proper rade.

It may happen that it wil be necessary to back ythe machine up a few feet and pass over the Awork a second time, in which case it becomes necessa so that the tampers ing tamper S are in their clear position, i. e., s0 that they will clear the upper surface of the concrete. In order to accomplish this I have provided a compound lever mechanism (see. Fig. 5) conslstin of a shaft 2 which is supported in suita le brackets 3.

and 4 which are secured upon the beams C and E Upon this shaft 2 is secured a cross arm 5 to the ends of which rods 6 6 are pivoted; the opposite ends of said rods being pivoted to lthe free ends of the bellcrank lever R Rf Upon the shaft 2 is secured a hand lever 7, a suitable segment 8 with notches in its periphery being secured upon the bracket 4, said lever 7 being provided with a spring latch mechanism 9 adapted to engage notches in the segment 8 to retain the lever in the positions to which it is moved. By throwing the lever 7 to the position shown in Fig. 4, the strike-ofi' plate Q, is raised sufiiciently to clear the upper surface of the cement.

. Upon the shaft 2 between the brackets 3 and 4 I place a tube 10. On one endl of this tube 10 is secured a lever 11, and between the free end of the lever 11 and the v (see Figs. 4 and 5). On the opposite end of the tube 10 is another lever 13 to which a spring 14 is attached by -means of an adjusting screw 15 (ses Fig. 4),K theopposite end of -said spring being secured to an offset 16 on the lever 7 .1 The bracket 3 isv provided with a. forwardly projecting 'bifurcated arm 17,

which is parallel wlth and under .the shaft 2.r Within this bifurcated arm 17 is pivoted a Vlatch bar 18 which has a. downward l gaged projecting shoulder 19 adapted to be enb the upper` edge of the clearing tamper S when the 'same is raised upwardly as shown in Fig. 5. This latch 18 isprovided with a spring 19a which normally presses the rear end of the latch bar 18 downward.

Upon the tube 10 is secured a downwardly projecting arm 20 which has a beveled rear surface 21. This arm 20 enga es the latch 18 and prevents the tube 10 rom turning when the lever 7 is thrown over to the position shown in Fig. 4, and retains it immovable until the bell-crank levers S? raise the clearing Itamper S to its highest position,

'l which causes the clearing tamper S to engage the shoulder 19 ofthe latch-bar 18 and disengage the same from the arm 20, which releases the tube 10 to the action of the spring-y to stop -the machinery and H2 and the clearv any large I 14 so that the said springwill rotate the tube l0 andv operate the small clutch lever i to open the clutch I', thereby stopping the operatlon Aof all of t the machine.

The lever. N' -is then operated to close the clutch N which causes the machine to move backward as hereinbefore described.

`Of course -it is understood that before the to close the tamper clutc I and the lever 7 at the same time operating the Shaft 2 to drop the strike-ofi' plate Q again to its proper position; afterv which the machine is again ready to move forward.

In Fi 8 and 9 I have shown a different form o clearing tamper, in which I provlde a plate 23 to which downwardly projecting fingers or rods 24 are secured, which through openings in the channel iron V2, the said plate 23 being provided with a vertical rib or flange 25 to which v'the link bar 26 is pivoted, the opposite end of said link bar being pivoted to the bell-crank levers AS2 so that in operation the fingers 24 are given a vertical movement and are forced downwardly into the mass of concrete so as to engage and push downward particles of broken stone or gravel whlch might engage the lower edge of the strike-oil plate Q, and cause deep grooves to be made in the surface of the cement.

The operation of the mechanism shown in F'gs. 8 and .9 is identical with the operation of the clearing `tamper plate S shown in the other' figs. j

Having thus shown and described the construction and operation of my invention, I do not desire to be limited to the exact form of mechanism 1 which I have shown and described, as many modifications can be made therein without departing from the scope of my invention. Therefore, what I claim as new anddes'ire to secure by Letters Patent is 1. In a machine of the class described, a vertically moveable strike-oli'l plate, manually operated lever mechanism to raise and lower said strike-ofi' plate,'and 'means t0 engage said lever mechanism and jlock it against movement whereby said strike-off plate will Abe rigidly maintained at any desired elevation. f'

2, In aV machine ofthe class-described, ay

e tamping mechanism of i to be released,`so thatthe ually operated lever,v rods connected with said manual-ly operated lever and said rst mentioned levers, and latch mechanisms to -lock said manually operated lever in the desired position.

3. lln a machine .of the class described, a

strike-od plate adapted to strike on? a layer of plastic cement to the required thickness, a vertically reciprocating clearing tamper lo suspended adjacent to and in front of said strike-0H plate, and power driven mechanism adapted to force said clearing tamper downward into the cement and lift it out of the same. d. ln a machine ol the class described, a vehicle, a strike-od' plate mounted in the frame thereof, a vertically reciprocatingu clearing tamper adjacent to and in frontof said strike-oil plate, and4 motor, gear and 4 20 lever mechanism to impart vertical reciprocation to said clearing tamper. 5. In a machine of the class described, a vehicle, a strike-ofi' plate mounted in the frame thereof, a vertically reciprocating clearing tamper adjacent to and in front of said strike-0E plate', bell-crank levers mounted in the frame of said vehicle, links pivoted to one arm of said levers and to said clearing tam er plate, and motor, gear and pitman mec anism to oscillate said bellcrank lever whereby vertical reciprocations are imparted to said clearing tamper plate. 6. ln a machine of the class described, a vehicle, a vertically moveable strike-off plate mounted on the vehicle frame, lever mechanism to raise and lower said strikeod plate, a Istationary strike-oil plate -mounted in said vehicle frame, land suspended in front of said moveable strike-ofi' 40 plate, the lower edge of said stationary strike-oli1 being at a higher elevation than the lower edge of said moveable strike-oil. 7. ln a machine of the class described, a vehicle. adapted to travel over a proposed pavement, a transverse beam in the frame of said vehicle, brackets secured on the front fa'ce ofsaid beam having slotted holes therethrough,-a strike-od plate,bolts passing through said plate and through said slotted to holes, lever mechanism adapted lto raise and lower said strike-oilI plate, L-shaped brackets secured upon' said beam andextendin fprwardly and downwardly in front of said moveable strike-oft" plate, and a stationary strike-od plate secured on said brackets' at a,v higher elevation than said moveable strike-0E plate.

-8. In a machine of the class described, a vehicle adapted to travel over a proposed pavement, a transverse beam in the frame of said machine,I avertically moveable strikeolf plate supported on' said beam, lever mechanism to raise and lower said strikeod plate, a vertically reciprocating clearing tamper in front of said strike-od plate,

merece lever and gear mechanism adapted to impart vertical reciprocation to said clearing tamper, and a stationary strike-oil plate su ported upon said beam in frontof said clearing tamper.

9. ln a machine of the class described, a vehicle, a strike-0H' plate therein, a clearing tamper in front of said strike-od` plate, bellcrank lever and link mechanism to support said clearing tamper, gear mechanism te mounted in the vehicle frame, a pitman slidably pivoted to said bell-crank lever and to an eccentric pin on one of said gears, and spring cushion mechanism on said pitman adapted to cushion the forward thrust of t@ said pitman against said bell-crank lever, whereby the downward thrust of said clearing tamper. is allowed to yield when unyielding obstacles are encountered.

10. lin a machine of the class described, a El@ vehicle frame, vertically moving tampers mounted therein, a vertically moveable strike-oili plate, a vertically moving clearing tamper mounted therein, motor, gear and lever mechanism for operating said tamping @d mechanisms, clutch mechanism adaptedto be operated to stop and start said gear and lever mechanism, spring actuated lever mechanism adapted to close and release said clutch, latch mechanism adapted to be en- 0K5 gaged and released by said clearingtamper to permit said spring actuated lever mechanism to open said clutch when the clearing tamper has reached the end of its upward movement whereby the tampers w1ll be stopped while clear of the nished surface of the pavement, and manually operated lever mechanism adapted'to raise said strikeod plate a-nd put tension on the spring of said spring actuated lever mechanism.

1 11. lin a lever mechanism for a machine of the class described, a shaft mounted in suitable brackets, a hand lever secured thereon, across-arm on the opposite end of said shaft, rods extending from the ends of said crossil@ arm to bell-crank levers which support a strike-0Hl plate, a, clutch operating lever mounted in the machine frame, a tube on said shaft, a lever on said tube,`a link-bar connecting said lever and said clutch levej. a bracket, a spring pressed latch pivoted 'in said bracket, a clearing tamper adapted to engage and operate said latch at the upper end of its stroke, a stop secured on said tube adapted to engage said latch and restrain the rotation of said tube, an operating lever on said tube, a spring secured .to said operating lever andV to said hand lever, an oil-set- Shoulder on said operating lever adapted to overlap said hand lever, whereby when said 1215 hand lever is operated in one direction tension is put upon said springs so that the l same will rotate said tube when the latch is released by the clearing tamper.

12. lln a machine of the class described. a 13e plurality of vertically moving tamping devices, motor, gear and clutch mechanism for operating said devices, a vertically moveable strike-off plate, a manually operated lever mechanism for raising said strike-ofi' plate, sprin and lever mechanism foroperating said c utch mechanism and latch mechanism positioned in the path'of one of said vertip by it may be engaged and operated lby 10 said tamping device to release said Sprinl and lever mechanisms to' open'said clutc mechanism when all of said tamping- .devices have been raised above the surface being tamped. "15 In testimony whereof I aix my signature,

JOHN M. RMHMELL. 

